Rolling mill for rings



y 1955 s. H. KARRBERG ETAL 3,

ROLLING MILL FOR RINGS Filed Dec. 15. 1961 V gpvzu'rons'. GUSTAF HERMAN KARRBERG KARL GUSTAV EINAR DERMAN ATT Ys:

United States Patent 3,196,651 ROLLING MILL FOR RINGS Gustaf Herman Kiirrberg, Tisdagsgat 1, Goteborg, Swe- The present invention relates to a rolling mill for rings in which the rings are rolled alternately in a pair of matrices. In accordance with the present invention, the mill includes a piston reciprocable with respect to the matrices between opposite limit positions to form alternately the bottom of one matrix and eject a finish rolled ring from the other matrix.

An object of the present invention is to provide a rolling mill having novel features of construction and arrangement whereby annular blanks may be precisely formed into finish rolled rings easily and economically.

Other objects of the present invention are more fully set forth and the various details of a rolling mill in accordance with the present invention are described more specifically hereinafter with reference to the accompanying drawing in which:

The figure is a sectional view through a rolling mill in accordance with the present invention showing various details thereof.

Referring now to the drawing, there is shown a rolling mill constructed in accordance with the present invention. The mill includes a frame 15, a rotatable sleeve-shaped matrix carrier 2 mounted in the frame 15 and a pair of matrices in the form of annular members 1a and 11) mounted at opposite axial ends of the carrier 2. The inner cylindrical surfaces of the annular members form the side walls of the matrices. The matrix carrier 2 is supported at its outer ends by rolling bearings 3 mounted in a bearing housing 4 and is connected to suitable drive means, for example, a motor (not shown) for rotational movement through V-belts 32 which engage grooves 5 in the outer peripheral surface of the matrix carrier.

The bearing housing 4 is mounted for vertical displacement in the mill by means of an eccentric arrangement comprising a shaft 9 mounted in the bearing housing 4 having stub shafts or terminal end portions 10a and 1012 which in turn are supported on bearings 11a and 11b in chambers 12a and 12b respectively in the frame 15. A gear wheel 25 is supported on the shaft 101) which meshes with a gear wheel 24 supported in the frame 15 and which is driven for example, by a motor (not shown). Accordingly when the shaft 1% is turned through the gear wheel 24, the bearing housing 4 is raised or lowered in a vertical direction by means of the eccentric 9.

The bearing housing 4 is also displaceable selectively laterally of the frame of the mill. In the present instance this is accomplished by providing a pump which draws oil from an oil reservoir 22 through a line 23. From the pump 20 the oil is fed through a line 21 and a reversable valve 19 selectively to the chambers 12a and 12b through lines 13a and 13b respectively. It is noted that the bearings 11a and 11b serve as sealing members for the chambers 12a and 12b respectively. In the position illustrated, the valve 19 is set for flow from the reservoir 22 to the chamber 1212. When the position of the valve 19 is reversed to the position shown in broken lines, the pump 20 delivers oil to the chamber 12a which in turn moves the bearing housing 4 to the right. The oil in the chamber 12b is displaced and flows through the line 13b, valve 19 and line 18 back to the reservoir 22.

In accordance with the present invention, the bottom of each matrix is formed by the outer end face of pistons 3,196,651 Patented July 27, 1965 fixed at opposite ends of a reciprocable rod 7 mounted interiorly of the matrix carrier 2 and actuable axially thereof. In the present instance the piston 6a is in a position forming the bottom of the left-hand matrix during rolling of a ring therein while the piston 6b in the right-hand matrix is in the position for ejecting a finish rolled ring.

The rolling operation is carried out in the following manner. An annular blank 14a is placed on a roll 8 rotatably mounted in the frame 15 at the right-hand side of the mill. The bearing housing 4 is then raised by actuating the eccentric 9 through the gear wheel 24 to a position where the right-hand matrix 1b is aligned with the roll 8 to receive the annular blank 14a. Simultane ously the bearing housing 4 is moved to the right. This is accomplished by reversing the valve 19 to the position shown in dotted lines to permit passage of oil under pressure to the left-hand chamber 12a through the line 21, the valve.19 and line 13a. This in turn moves the bearing housing 4 to the right whereby the shaft 1% displaces the fiuid in the chamber 1212 through the line 1312, the valve 19 and then to the reservoir through line 13. The bearing housing 4 is moved laterally to the right until it abuts the adjustable stop 17. During movement of the housing 4, the roll 8 contacts the end face of the piston 6b thereby moving the piston rod 7 and pistons relative to the matrices until the piston 6b engages a shoulder 34 on the matrix carrier 2. It is noted that in this position of the piston 6b, the bottom of the right-hand matrix is determined. During displacement of the bearing housing 4, the ring 1411 which has been finished rolled in the left-hand matrix 1a is ejected therefrom by movement of the piston rod 7. Thereafter the bearing housing is lowered through the eccentric 9 and the gear wheel 24 during which time the blank 14a is finished rolled. During this time the matrix carrier 2 is rotated to finish the annular blank 14a in the manner desired. When the assembly 4 has reached the lower position, the blank 14a is finish rolled and the cycle described may be repeated to finish roll another annular blank in the left-hand matrix.

In accordance with the present invention, annular blanks may be formed into rings for ball bearing assemblies for example, and the dimensions thereof maintained precisely so that they can be hardened and ground when they leave the mill. It is noted that with the mill of the present invention the roll 8 is very accurately positioned relative to the matrices and the pistons 6a, 6b so that the inner dimensions of the rings can therefore be kept within close tolerances. The outer diameter of the an nular blanks is accurately determined by the inner peripheral surface of the matrix rings and the bottom of the matrix is axially determined by the adjustable stop 17 and engagement of the piston against the shoulder 34. Accordingly if the volume of the annular blank is greater than that of the desired finish rolled ring, the excess material of the blank is forced axially toward the roll 8. In the present instance this material is removed by a lathe tool 16 fixed on the frame 15 of the mill. It is noted that the position of the lathe tool 16 is determined relative to that of the roll 8 and accordingly a rolled ring is thus finished to very accurate tolerances. From the foregoing it may be seen that with the rolling mill of the present invention, a particular size ring may be formed within desired tolerances and all of the rings thus formed are of a uniform size and shape. However the rolling mill of the present invention may be used to form rings of various types and sizes by changing the matrices, the pistons 6a and 6b and the rolls 8.

While a particular embodiment of the present invention has been illustrated and described herein, it is not intended to limit the invention and changes and modifica- 3 tions may be made therein within the scope of the following claims.

We claim:

1. In a rolling mill including a frame structure and means mounted in the frame structure for working annular blanks into rolled blanks, a matrix carrier, a pair of spaced apart matrices mounted in said carrier wherein rolling of the blanks is effected, an ejector piston mounted in each matrix, means mounting the pistons and matrix carrier for relative movement, said pistons being coupled together whereby upon relative movement of the carrier and pistons, one of said pistons is positioned relative to its matrix to accommodate an annular blank for rolling therein and the other piston is positioned relative to its matrix to eject a rolled blank therefrom.

2. A rolling mill according to claim 1 having for each matrix a stationary cutting tool mounted on the frame operable during rolling of a blank in the matrix to remove excess material from the blank being rolled.

3. A rolling mill according to claim 1 wherein said Work means comprises a member adjacent each of said matrices whereon an annular blank is supported and wherein said matrix carrier is actuatable relative to said members whereby upon actuation thereof said members alternately effect actuation of said pistons relative to said matrix carrier to position one of said pistons relative to its matrix to receive an annular blank and to position the other piston relative to its matrix to eject a rolled blank therefrom.

4. A rolling mill as claimed in claim 3 wherein said member is a roller projecting with a radial clearance into its associated matrix, said roller cooperating with said matrix to effect rolling of the blank therein.

5. A rolling mill according to claim 4, wherein each roller member has a flange against which the annular blank abuts to locate the blank axially of the roller.

6. A rolling mill according to claim 3, wherein the members are immovable in the direction of movement of the ejector pistons and the matrix carrier is mounted for back and forth movement in this direction to alternately .position the pistons relative to their respective matrices to accommodate a blank and eject a rolled blank.

7. A rolling mill according to claim 1 wherein the matrix carrier is mounted in a housing which is movable in said direction of movement of the pistons including power means for effecting movement of the housing thereby also effecting movement of the matrix carrier.

8. A rolling mill according to claim '7 wherein said power means comprise means defining aligned chambers in the frame structure, a shaft mounted in said housing having terminal end portions engageable in said chamhers, and means to supply hydraulic fluid alternatively to said chambers whereby said housing and matrix carrier are moved back and forth relative to said rollers.

9. A rolling mill according to claim 7 having adjustable stops for limiting the movement of said housing.

lltlJA rolling mill according to claim 8 including means for actuating said housing and matrix carrier radially relative to said rollers thereby to vary the clear ance between the rollers and said matrices.

11. A rolling mill according to claim 8 wherein the central axis of each of said terminal end portions of said shaft are offset radially from the central axis of said shaft and including means to rotate said shaft whereby said housing and matrix carrier are displaced radially relative to said rollers.

12. A rolling mill according to claim 1, wherein the matrices are aligned and are co-axial with the axis of rotation of the matrix carrier, and the carrier has a straight bore between the matrices which accommodates a rod to the ends of which the ejector pistons are secured.

References Cited by the Examiner UNITED STATES PATENTS 574,162 12/96 Prentice 29-36 965,038 7/10 Slick 5 1,483,069 2/24 Browne 805 1,904,734 4/33 Sch-laa 80-5 2,645,000 7/53 Finch 29-57 CHARLES W. LANHAM, Primary Examiner. WILLIAM J. STEPHENSON, LEON PEAR, Examiners.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No 3 ,l96,651 July 27, 1965 Gustaf Herman Karrberg et a1,

It is hereby certified that error appears in the above numbered patent requiring correction and that the said Letters Patent should read as corrected below.

In the grant, lines 1 and 2, for "Gustaf Herman Karrberg, of Goteborg, Sweden, and Karl Gustav Einar Derman, of Savedalen, Sweden," read Gustaf Herman K'airlrberg, of Goteborg, Sweden and Karl Gustav Einar Derman, of Savedalen, Sweden, assignors to Aktiebolaget Svenska Kullagerfabriken, of Goteborg, Sweden, a corporation of Sweden, lines 11 and 12, for "Gustaf Herman Karrberg and Karl Gustav Einar Derman, their heirs" read Aktiebolaget Svenska Kullagerfabriken, its successors in the heading to the printed specification, lines 3 to 5, for "Gustaf Herman Karrberg, Tisdagsgat l, Goteborg, Sweden, and Karl Gustav Einar Derman, St. Angsvagen 15B, Savedalen, Sweden" read Gustaf Herman Karrberg, Goteborg, Sweden, and Karl Gustav Einar Derman, Savedalen, Sweden, assignors to Aktiebolaget Svenska Kullagerfabriken, Goteborg, Sweden, a corporation of Sweden Signed and sealed this 29th day of March 1966.

(SEAL) Attest:

ERNEST W. SWIDER EDWARD J, BRENNER Attesting Officer Commissioner of Patents 

1. IN A ROLLING MILL INCLUDING A FRAME STRUCTURE AND MEANS MOUNTED IN THE FRAME STRUCTURE FOR WORKING ANNULAR BLANKS INTO ROLLED BLANKS, A MATRIX CARRIER, A PAIR OF SPACED APRT MATRICES MOUNTED IN SAID CARRIER WHEREIN ROLLING OF THE BLANKS IS EFFECTED, AN EJECTOR PISTON MOUNTED IN EACH MATRIX, MEANS MOUNTING THE PISTONS AND MATRIX CARRIER FOR RELATIVE MOVEMENT, SAID PISTONS BEING COUPLED TOGETHER WHEREBY UPON RELATIVE MOVEMENT OF THE CARRIER AND PISTONS, ONE OF SAID PISTONS IS POSITIONED RELATIVE TO ITS MATRIX TO ACCOMMODATE AN ANNULAR BLANK FOR ROLLING THEREIN AND THE OTHER PISTON IS POSITIONED RELATIVE TO ITS MATRIX TO EJECT A ROLLED BLANK THEREFROM. 